For a long time the gpio-omap custom PM calls have been annoying me so
let's replace them with cpu_pm instead. This will enable GPIO PM for
deeper idle states on omap4. And we can handle GPIO PM for omap2/3/4
in the same way.

Note that with this patch we are also slightly changing GPIO PM to be
less aggressive for omap3 and only will idle GPIO when PER context
may be lost.

For omap2, we don't need to save context and don't want to remove any
triggering so let's add a quirk flag for that.

Let's do this all in a single patch to avoid a situation where old
custom calls still are used with new code.

Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Ladislav Michl <redacted>
Cc: Tero Kristo <redacted>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
  arch/arm/mach-omap2/pm24xx.c            |   7 +-
  arch/arm/mach-omap2/pm34xx.c            |  14 +-
  drivers/gpio/gpio-omap.c                | 178 ++++++++++++++----------
  include/linux/platform_data/gpio-omap.h |  13 --
  4 files changed, 116 insertions(+), 96 deletions(-)

diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c

@@ -18,6 +18,7 @@
   * published by the Free Software Foundation.
   */
  

+		goto unlock;
+	}
+	omap_gpio_idle(bank, true);
+	bank->is_suspended = true;
+unlock:
+	raw_spin_unlock_irqrestore(&bank->lock, flags);
+
+	return error;
+}
+
+static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = platform_get_drvdata(pdev);
+	unsigned long flags;
+	int error = 0;
+
+	raw_spin_lock_irqsave(&bank->lock, flags);
+	/* Must be unidled only by CPU_CLUSTER_PM_ENTER? */
+	if (bank->irq_usage) {
+		error = -EBUSY;
+		goto unlock;
+	}
+	omap_gpio_unidle(bank);
+	bank->is_suspended = false;
+unlock:
+	raw_spin_unlock_irqrestore(&bank->lock, flags);
+
+	return error;
+}
+
+#ifdef CONFIG_ARCH_OMAP2PLUS
  static const struct dev_pm_ops gpio_pm_ops = {
  	SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
  									NULL)
  };
+#else
+static const struct dev_pm_ops gpio_pm_ops;
+#endif	/* CONFIG_ARCH_OMAP2PLUS */
  
  #if defined(CONFIG_OF)
  static struct omap_gpio_reg_offs omap2_gpio_regs = {

@@ -1774,6 +1805,11 @@ static struct omap_gpio_reg_offs omap4_gpio_regs = {
  	.fallingdetect =	OMAP4_GPIO_FALLINGDETECT,
  };